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St. John was born Jason Geiger[2] in Roswell, New Mexico, U.S. on September 17, 1974, the son of U.S. Marine and martial artist Steve Geiger and his wife Sharon.[3] He has one sibling, a brother named Stephen. With a parent in the armed forces, St. John lived all over the United States whilst growing up.

St. John's first acting role and most well known role to date came to him when he was just a teenager, when he was cast as teen superhero Jason Lee Scott in Mighty Morphin Power Rangers, the first installment of the Power Rangers franchise, which debuted on Fox Kids in 1993. For his role, he took the stage name Austin St. John, Austin coming from The Six Million Dollar Man'sSteve Austin and St. John being a name of his own choosing.[2] Like St. John, his character had a background in martial arts. Though the series was hugely successful and brought St. John international recognition as an actor, long hours on set combined with low pay presented real challenges for him and he, along with co-stars Walter Emanuel Jones and Thuy Trang, decided to leave the show during its second season and he was replaced by Steve Cardenas.[4] St. John went onto reprise the role of Jason several times over, in both film and television, and his last appearance as the character was in 2002, in an episode of Power Rangers Wild Force entitled “Forever Red”. He also appeared alongside Jones, as himself, in the Power Rangers special The Lost Episode in 1999, which focused on the history of the franchise up to that point and showed the original pilot episode for the series, which had never before been aired. In 2020, St. John will reprise the role of Jason for an episode on the second season of Power Rangers Beast Morphers.[5]

Aside from his involvement with the Power Rangers franchise, St. John, has had few acting roles, most of them limited to films that were not released theatrically nor received critical acclaim. However, as of February 2018, his official page on IMDb shows that he is shown to be involved with several yet-to-be released films.

St. John began as a proficient martial artist, holding a second-degree black belt in Taekwondo and a first-degree black belt in Judo, and for a time, he worked as a martial arts instructor.[6] Additionally, he published a book on the subject, Karate Warrior: A Beginner's Guide to Martial Arts, in 1996.[7]